Manufacture and production of baking-powder.



UNITED STATES ratrnn r OFFICE.

BERTHOLD FEDERER, 0F SOHMARSE, GERMANY, ASSIGNOR TO CHEMISCHE FABRIKVORM. GOLDENBERG, GEROMONT & CIE., OF WINKEL-ON-THE-RHINE, GERMANY.

MANUFACTURE AND PRODUCTION OF BAKING-POWDER.

No Drawing.

To all whom it may concern:

Be it known that I, Bnn'rnono Fnonnnn, a subject of the Emperor ofAustria-Hungary, andresident of Schmarse, Silesia, Germany, haveinvented certain new and useful improvements in the Manufacture andProduction of Bakingdowder, of which the following is a specification.

For the manufacture of baking powder, the ditiicultly soluble acidpotassium tartrate has been mainly used together with acid sodiumcarbonate; the use of the said acid potassium tartrate is howevercostly, because only one half of the tartaric acid enters into thereaction. It has, therefore, been attempted to use tartaric acid itselffor making baking powders, rendering the acid more ditlicultlysoluble bycoating it with a protective covering.

This coating was obtained by stirring and mixing the tartaric acid orthe bicarbonate, or both substances, with the )rotective coverin in amolten condition.. l c

and mixing the baking powder with these substances which solidified oncooling. For coating the chemicals, large amounts of the moltensubstances '1'. 6. about 10 per cent. were necessary. According toanother proposal the coating was effected by mixing the tartaric acidwith ethereal and fatty oils in alcoholic solution, so that after thesolvent had been evaporated, a layer of oil remained on the tartaricacid. This layer of oil however prevented the baking powder thusproduced possessing the requisite pulverulent form, as it acquired afatty, unctuous consistency.

The object of the present invention is to treat the acid constituents ofthe baking powder, such, for instance, as tartaric acid, citric acid, orother suitable acid, or salts thereof, or the carbonate constituent, orboth active constituents of the baking powder with substances dissolvedin a suitable solvent, which are also solid at ordinary temperatures,but become liquid at a higher temperature. Substances of this kind arehydrocarbons, fatty acids, waxes, including beeswax and vegetable wax,spermaceti, and other like substances. After the solvent hasSpecification of Letters Patent.

Application filed December 16, 1909.

Patented Jan. 10, 1911.

Serial No. 533,331.

been evaporated in a suitable apparatus, there remains on the product tobe coated, a thin layer of the solid impregnating material, such as isoften found in nature as a protective layer on plants and fruits. Asthis layer is quite uniformly distributed on the product to be coatedand consists of a solid substance, the penetration of water at ordinarytemperature is rendered practically impossible.

As an example, 4 arts of wax are dissolved in 40 parts 0 ligroin, onehalf of this solution is mixed with parts of pulverized tartaric acidand the other half with 84 parts sodium bicarbonate. When the solventhas been evaporated in a vacuum apparatus, the impregnated chemicals aresifted and mixed together with from 100, to 150, parts of starch powder.

.In order to prevent the action of the baking powder taking place tooviolently at the moment the coating melts, coatings melting at differenttemperatures may be used. Thus, for instance, one portion of tartaricacid may be coated with stearic acid and another portion with wax andthe products be mixed. As the melting point of stearin is higher thanthat of wax, the portion coated with stearin becomes active later thandoes the portion coated with wax, thus permitting the reaction to takeplace in a very advantageous manner.

Having now particularly described and ascertained the nature of my saidinvention, and in what manner the same is to be performed, I declarethat what I claim is:

1. The process of making baking powder, comprising treating an activeconstituent with a substance, which is solid at ordinary temperaturesbut melts at higher temperatures, dissolved in a volatile solvent so asto leave when evaporated a solid coating on the active substance.

2. The process of making baking powder, comprising treating an activeconstituent with wax, dissolved in a volatile solvent so as to leavewhen evaporated a solid coating on the active substance.

3. The process of making baking powder,

comprising coating different portions of an In testimony'whereof I havesigned my active constituent with substances WhlCh name to thisspecification in thepresence of melt at different temperatures. twosubscribing witnesses.

4. A baking powder containing an active BERTHOLD FEDERER. constituentdlfierent portions of which are Witnesses:

coated with substanceswhich melt at dif- ERNST KATz,

ferent temperatures. 7 ERNST B. HrRscH.

